Move document sidebar entries extraction to document.View
This way other modules can benefit from the same logic. Also make use
of the sidebar.getSidebarMenu method so that getMenusForScope is no
longer specific to full menu's.
Patch by: Sverre Rabbelier
"""
Make sure that the content type cache (see ContentTypeManager) works correctly.
Lookups for a particular content type -- by model or by ID -- should hit the
database only on the first lookup.
First, let's make sure we're dealing with a blank slate (and that DEBUG is on so
that queries get logged)::
>>> from django.conf import settings
>>> settings.DEBUG = True
>>> from django.contrib.contenttypes.models import ContentType
>>> ContentType.objects.clear_cache()
>>> from django import db
>>> db.reset_queries()
At this point, a lookup for a ContentType should hit the DB::
>>> ContentType.objects.get_for_model(ContentType)
<ContentType: content type>
>>> len(db.connection.queries)
1
A second hit, though, won't hit the DB, nor will a lookup by ID::
>>> ct = ContentType.objects.get_for_model(ContentType)
>>> len(db.connection.queries)
1
>>> ContentType.objects.get_for_id(ct.id)
<ContentType: content type>
>>> len(db.connection.queries)
1
Once we clear the cache, another lookup will again hit the DB::
>>> ContentType.objects.clear_cache()
>>> ContentType.objects.get_for_model(ContentType)
<ContentType: content type>
>>> len(db.connection.queries)
2
Don't forget to reset DEBUG!
>>> settings.DEBUG = False
"""